Allen-Bradley 1756-CNB User Manual page 37

Guideline
Do the redundant chassis use more than 1 ControlNet
network?
• Yes — See page 29.
• No — Skip this guideline.
If the smallest Then the largest NUT on any other
NUT on a network network must be less than or equal
is (ms) to (ms)
2 15
3 17
4 19
5 21
6 23
7 25
8 27
9 29
10 31
11 33
12 35
13 37
14 39
15 41
16 43
17 46
18 48
19 50
20 52
Details
The NUT of each network must be within the values indicated on page 29. If
you use a larger network update time (NUT), the controller could lose its
connection with a module during a switchover. This could cause outputs to
change state.
Example
If the NUT of this network is 5 ms...
ControlNet
Network 1
Then the NUT of this network must be
21 ms or less.
If the smallest Then the largest NUT on any other
NUT on a network network must be less than or equal
is (ms) to (ms)
21 55
22 57
23 59
24 62
25 64
26 66
27 68
28 71
29 73
30 75
31 78
32 80
33 82
34 84
35 87
36 89
37...90 90
Publication 1756-UM523F-EN-P - December 2006
Design the System 37
ControlNet
Network 2